+----------------------------------------------------------+ | WFPC2 | STScI Analysis Newsletter | WFPC2 STAN 53 | November 2002 +----------------------------------------------------------+ CONTENTS: - WFPC2 Close-Out Calibration Programs - Pointing Uncertainties - Instrument Science Reports Since The Previous STAN: 02-04 An Analysis of WFPC2 Filter Positional Anomalies 02-05 WFPC2 Cycle 11 Calibration Plan 02-06 SMOV3b 02-07 Updated Contamination Rates for WFPC2 UV Filters - Jay Anderson and Ivan King Astrometry Paper on the Website - Re-organization of the WFPC2 Documents on the Website +----------------------------------------------------------+ WFPC2 Close-Out Calibration Programs -Anton Koekemoer Cycle 12 is currently planned to be the last full cycle for WFPC2, which will be de-orbited during the next Servicing Mission (SM4) when it is scheduled to be replaced with WFC3. Therefore, we are currently soliciting input from the community as to whether there are any additional calibration programs that should be carried out with WFPC2 before it is de-orbited, in order to improve or augment calibration accuracies or explore new types of calibration. In conjunction with the recent HST Calibration Workshop, a special splinter session was devoted to the topic of WFPC2 close-out, and a number of possible programs were identified. Some examples of these included further refinements to the geometric solution, improvements to the filter photometric characterizations, better measurements of the PSF wings on large scales, and improving the CTE characterization. We therefore encourage any interested members of the community to contact us with suggestions for Cycle 12 calibration observations, which we will be defining in the next few months. These may fall under the above categories or alternatively address other issues that may be required in order to improve the scientific value of archival WFPC2 data. We also remind observers of the opportunity to submit Calibration Outsourcing proposals of your own in Cycle 12. These may be observational, archival, or both. Additional topics for Calibration Outsourcing programs are listed at this website: http://www.stsci.edu/instruments/wfpc2/wfpc2_out.html Consultation with the WFPC2 group at STScI is also welcomed on any of these topics (just send an email to "help@stsci.edu" addressing the topic of WFPC2 Close-Out Calibration Programs). We will be happy to provide advice and collaborative input, and we strongly encourage members of the community to take the initiative in proposing any close-out programs that you feel would enhance the quality of some particular aspect of WFPC2 science. Pointing Uncertainties -Gabriel Brammer An offset of 1-2 arcsec is found between the predicted and actual pointing positions of a set of observations of the standard star GRW+70D5824 taken between Jan 1999 and Aug 2002. The direction of the offset in chip coordinates changes throughout the course of the year as the telescope orientation changes, causing the overall uncertainty in the absolute pointing of WFPC2 to be somewhat higher than the ~1 arcsec uncertainty in guide star positions. The r.m.s. of the pointings is approximately 1.5 arcsec, but two individual pointings of the same target observed about 6 months apart could differ by as much as 5 arcsec in the worst cases. This scatter is primarily due to misalignments of the three Fine Guidance Sensors, and is expected to be improved by an update to the observatory aperture file implemented on 20 Oct, 2002. Users requiring high absolute astrometric precision for a given image should measure positions relative to an astrometric standard found on the same frame, if possible. For more information, see the paper by Brammer, Whitmore, and Koekemoer in the proceedings of the 2002 HST Calibration Workshop (to be published in 2003). An Analysis of WFPC2 Filter Positional Anomalies -Shireen Gonzaga, Sylvia Baggett, John Biretta In March of 2001, a routine analysis of FR533N VISFLAT images revealed an anomaly: the filter wheel appeared to be offset by about 0.42 degrees in some images. This offset angle is close to 0.5 degrees, which corresponds to one "filter step," (i.e., one increment in movement of the filter wheel by the filter electronics). These offsets are not a recent phenomena, and have been found in data as far back as mid-1994. This document describes a more exhaustive analysis of the filter wheel rotation anomaly: flatfield images for all available filters in the archive were inspected to determine if they exhibited similar behavior. Only filters that projected unique features (such as pinholes) onto the image were useful because these features were needed to detect the offsets. In addition to the previously-reported problem with FR533N, filter wheel rotation offsets have also now been found in these additional filter configurations: F375N, FR418N, FR533N18, FR533N33, FR533P15, FR680N, FR680N33, FQCH4N, FQCH4N15, and FQCH4P15. The offset angle was found to be 0.42 +/- 0.06. The occurrence rate of the offset error ranges from 0% to 40% for these filters (based on samples of 20 images or larger). It is also apparent that some filters (e.g. F160BW) show no rotation errors. In general, the errors will have little impact on GO science, though photometric errors can reach a few percent in worst-case scenarios. There is also some hint that the problem may be getting worse with time. Currently, the cause of the anomaly is not completely understood. Cycle 10 and cycle 11 calibration programs will continue monitoring these filter wheel offsets. WFPC2 Cycle 11 Calibration Plan -S. Gonzaga, and the WFPC2 Group The Cycle 11 Calibration Program, extending from July 1, 2002 to June 30, 2003 will continue to monitor the health of WFPC2, using the standard suite of calibrations, as well as some special programs to characterize other aspects of the instrument. The most significant change in the routine monitors concerns the length of time between decontaminations. This period has been increased from 28 days to 49 days because data from the last few cycles indicate that the contamination rate has been decreasing. Special programs include more efforts to characterize CTE, a revisit of the long-vs.-short anomaly, photometry of non-standard filters for creating new zeropoints, as well as a program to cross-calibrate WFPC2 and ACS filters. Because there are significantly fewer primary WFPC2 science observations in cycle 11, with the advent of ACS, the calibration plan has been significantly scaled back, but without sacrificing the quality of data required to calibrate the instrument. For cycle 11, 40 external orbits will be used, compared to 61 in cycle 10. WFPC2 SMOV3b -Anton Koekemoer Servicing Mission 3B (SM3B) took place in March 2002, and the Wide Field and Planetary Camera 2 (WFPC2) resumed operations on March 23, 2002, after having been placed in an inactive mode during the Servicing Mission. We describe here the results from an extensive series of tests and observations that we carried out with WFPC2 as part of the subsequent Observatory Verification phase. These tests included UV monitoring of possible contamination, performance checks of the biases, darks and other internal calibrations, as well as PSF measurements and flatfield verification. The results from these tests show that there are no significant changes in the operational behavior of the camera with respect to its pre-SM3B performance. Updated Contamination Rates for WFPC2 UV Filters -Matt McMaster and Brad Whitmore Photometric monitoring observations of a white dwarf standard (GRW+70D5824) have been used to update the contamination rates for WFPC2 UV filters. Observations from April 1994 through May 2002 were used in the analysis. In general, the contamination rates have declined by roughly 50% for most of the filters during this period. Least-squares fits have been made to the data to allow observers to remove the effects of contamination in their WFPC2 observations. An Improved Distortion Solution for HST's WFPC2 -Jay Anderson and Ivan King A preprint of a new paper by Jay Anderson and Ivan King on an improved distortion solution for WFPC2 is available on the WFPC2 website. The paper should appear in the Jan 2003 version of the PASP. A separate link points to a Fortran routine that implements the distortion solution. Re-organization of the WFPC2 Documents on the Website -Inge Heyer The documents section on the WFPC2 website has been re-organized to make documents easier to find. The documents have been grouped into Documents (Instrument Handbook, manuals, etc.) and General Resources (reference file lists, memos, etc.). Each section has an overview, and in addition, we have created a one-page sheet to list the primary references needed for proposal preparation and data reduction. Community feedback on this re-organization is welcomed. +----------------------------------------------------------+ | Recent WFPC2-related Papers/Preprints +----------------------------------------------------------+ We draw your attention to these papers, based on WF/PC and WFPC2 data, that have appeared since the last STAN, or will appear in the next few months. This list includes all preprints received by the STScI Library not yet published in the journals. Please remember to include our Library in your preprint distribution list. AFANASIEV, V.; SIL'CHENKO, O.K. "Complex Formation History of the Lenticular Galaxies with Stellar Counterrotation: NGC 4128 and NGC 4550" AJ 124: 706-721, 2002 AGUERRI, J.A.L.; TRUJILLO, I. "Restrictions to the Galaxy Evolutionary Models from the Hawaiian Deep Fields SSA13 and SSA22" MNRAS 333: 633-651, 2002 ALVES, D.R.; REJKUBA, M.; MINNITI, D.; COOK, K.H. "K-band Red Clump Distance to the Large Magellanic Cloud" ApJ 573: L51-L54, 2002 BALOGH, M.L.; COUCH, W.J.; SMAIL, I.; BOWER, R.G.; GLAZEBROOK, K. "An H alpha Survey of the Rich Cluster A 1689" MNRAS 335: 10-22, 2002 BENNERT, N.; FALCKE, H.; SCHULZ, H.; WILSON, A.S.; WILLS, B.J. "Size and Structure of the Narrow-Line Region of Quasars" ApJ 574: L105-L109, 2002 BENSON, A.J.; ELLIS, R.S.; MENANTEAU, F. "On the Continuous Formation of Field Spheroidal Galaxies in Hierarchical Models of Structure Formation" MNRAS 336: 564-576, 2002 BESWICK, R.J.; PEDLAR, A.; MCDONALD, A.R. "Sub-arcsecond Atomic Hydrogen Absorption in the Seyfert Galaxies NGC 7674 and NGC 7469" MNRAS 335: 1091-1099, 2002 BROTHERTON, M.S.; GRABELSKY, M.; CANALIZO, G.; VAN BREUGEL, W.; FILIPPENKO, A.V.; CROOM, S.; BOYLE, B.; SHANKS, T. "Hubble Space Telescope Imaging of the Poststarburst Quasar UNJ1025-0040: Evidence for Recent Star Formation" PASP 114: 593-601, 2002 BUJARRABAL, V.; ALCOLEA, J.; SANCHEZ CONTRERAS, C.; SAHAI, R. "HST Observations of the Protoplanetary Nebula OH 231.8+4.2: the Structure of the Jets and Shocks" A&A 389: 271-285, 2002 CHATTERJEE, S.; CORDES, J.M. "Bow Shocks from Neutron Stars: Scaling Laws and Hubble Space Telescope Observations of the Guitar Nebula" ApJ 575: 407-418, 2002 CORBIN, M.R.; O'NEIL, E.; RIEKE, M.J. "Hubble Space Telescope NICMOS Imaging of the Core of M87" AJ 124: 183-190, 2002 COURBIN, F.; MEYLAN, G.; KNEIB, J.-P.; LIDMAN, C. "Cosmic Alignment Towards the Radio Einstein Ring PKS 1830-211?" ApJ 575: 95-102, 2002 CROCKER, M.M.; DAVIS, R.J.; SPENCER, R.E.; EYRES, S.P.S.; BODE, M.F.; SKOPAL, A. "The Symbiotic Star CH Cygni -- III. A Precessing Radio Jet" MNRAS 335: 1100-1108, 2002 CUZZI, J.N.; FRENCH, R.G.; DONES, L. "HST Multicolor (255-1042 nm) Photometry of Saturn's Main Rings. I: Radial Profiles, Phase and Opening Angle Variations, and Regional Spectra" Icarus 158: 199-223, 2002 DA COSTA, G.S.; ARMANDROFF, T.E.; CALDWELL, N. "The Dwarf Spheroidal Companions to M31: WFPC2 Observations of Andromeda III" AJ 124: 332-348, 2002 DOI, T.; O'DELL, C.R.; HARTIGAN, P. "Internal Velocities in the Orion Nebula: Large Proper-Motion Features" AJ 124: 445-463, 2002 DROZDOVSKY, I.O.; SCHULTE-LADBECK, R.E.; HOPP, U.; GREGGIO, L.; CRONE, M.M. "The Dwarf Irregular/Wolf-Rayet Galaxy NGC 4214. I. A New Distance, Stellar Content, and Global Parameters" AJ 124: 811-827, 2002 ERWIN, P.; SPARKE, L.S. "Double Bars, Inner Disks, and Nuclear Rings in Early-Type Disk Galaxies" AJ 124: 65-77, 2002 EYRES, S.P.S.; BODE, M.F.; SKOPAL, A.; CROCKER, M.M.; DAVIS, R.J.; TAYLOR, A.R.; TEODORANI, M.; ERRICO, L.; VITTONE, A.A.; ELKIN, V.G. "The Symbiotic Star CH Cygni -- II. The Ejecta from the 1998-2000 Active Phase" MNRAS 335: 526-538, 2002 FARRAH, D.; MEIKLE, W.P.S.; CLEMENTS, D.; ROWAN-ROBINSON, M.; MATTILA, S. "The Host Galaxies of Type Ia Supernovae at z = 0.6" MNRAS 336: L17-L21, 2002 GIRARDI, L.; BERTELLI, G.; BRESSAN, A.; CHIOSI, C.; GROENEWEGEN, M.A.T.; MARIGO, P.; SALASNICH, B.; WEISS, A. "Theoretical Isochrones in Several Photometric Systems. I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey Filter Sets" A&A 391: 195-212, 2002 GOAD, M.R.; ROBERTS, T.P.; KNIGGE, C.; LIRA, P. "The Optical Counterpart of the Ultraluminous X-ray Source NGC 5204 X-1" MNRAS 335: L67-L70, 2002 GONZALEZ DELGADO, R.M.; ARRIBAS, S.; PEREZ, E.; HECKMAN, T. "Is a Minor Merger Driving the Nuclear Activity in the Seyfert 2 Galaxy NGC 2110?" ApJ 579: 188-204, 2002 HALL, P.B.; RICHARDS, G.T.; YORK, D.G.; KEETON, C.R.; BOWEN, D.V.; SCHNEIDER, D.P.; SCHLEGEL, D.J.; BRINKMANN, J. "The Redshift of a Lensing Galaxy in PMN J0134-0931" ApJ 575: L51-L54, 2002 HAMILTON, T.S.; CASERTANO, S.; TURNSHEK, D.A. "The Luminosity Function of QSO Host Galaxies" ApJ 576: 61-74, 2002 HANSEN, B.M.S.; BREWER, J.; FAHLMAN, G.G.; GIBSON, B.K.; IBATA, R.; LIMONGI, M.; RICH, R.M.; RICHER, H.B.; SHARA, M.M.; STETSON, P.B. "The White Dwarf Cooling Sequence of the Globular Cluster Messier 4" ApJ 574: L155-L158, 2002 HARRIS, W.E.; HARRIS, G.L.H.; HOLLAND, S.T.; MCLAUGHLIN, D.E. "Structural Parameters for Globular Clusters in NGC 5128" AJ 124: 1435-1451, 2002 HESTER, J.J.; MORI, K.; BURROWS, D.; GALLAGHER, J.S.; GRAHAM, J.R.; HALVERSON, M.; KADER, A.; MICHEL, F.C.; SCOWEN, P. "Hubble Space Telescope and Chandra Monitoring of the Crab Synchrotron Nebula" ApJ 577: L49-L52, 2002 HOEKSTRA, H.; FRANX, M.; KUIJKEN, K.; VAN DOKKUM, P.G. "HST Large-Field Weak Lensing Analysis of MS 2053-04: Study of the Mass Distribution and Mass-to-Light Ratio of X-ray Luminous Clusters at 0.22 < z < 0.83" MNRAS 333: 911-922, 2002 HOMEIER, N.; GALLAGHER, J.S. III; PASQUALI, A. "The Star Cluster System of the NGC 7673 Starburst" A&A 391: 857-873, 2002 HUGGINS, P.J.; MAURON, N. "Small Scale Structure in Circumstellar Envelopes and the Origin of Globules in Planetary Nebulae" A&A 393: 273-283, 2002 JORDAN, A.; COTE, P.; WEST, M.J.; MARZKE, R.O. "The Relative Ages of the Globular Cluster Subpopulations in M87" ApJ 576: L113-L116, 2002 KARACHENTSEV, I.D.; SHARINA, M.E.; MAKAROV, D.I.; DOLPHIN, A.E.; GREBEL, E.K.; GEISLER, D.; GUHATHAKURTA, P.; HODGE, P.W.; KARACHENTSEVA, V.E.; SARAJEDINI, A.; SEITZER, P. "The Very Local Hubble Flow" A&A 389: 812-824, 2002 KERBER, L.O.; SANTIAGO, B.X.; CASTRO, R.; VALLS-GABAUD, D. "Analysis of Colour-Magnitude Diagrams of Rich LMC Clusters: NGC 1831" A&A 390: 121-132, 2002 KUIJKEN, K.; RICH, R.M. "Hubble Space Telescope WFPC2 Proper Motions in Two Bulge Fields: Kinematics and Stellar Population of the Galactic Bulge" AJ 124: 2054-2066, 2002 KUNDU, A.; MACCARONE, T.J.; ZEPF, S.E. "The Low-Mass X-ray Binary-Globular Cluster Connection in NGC 4472" ApJ 574: L5-L9, 2002 LARSEN, S.S. "The Luminosity Function of Star Clusters in Spiral Galaxies" AJ 124: 1393-1409, 2002 LARSEN, S.S.; BRODIE, J.P.; SARAJEDINI, A.; HUCHRA, J.P. "Structural Parameters and Dynamical Masses for Globular Clusters in M33" AJ 124: 2615-2624, 2002 LAUER, T.R.; GEBHARDT, K.; RICHSTONE, D.; TREMAINE, S.; BENDER, R.; BOWER, G.; DRESSLER, A.; FABER, S.M.; FILIPPENKO, A.V.; GREEN, R.; GRILLMAIR, C.J.; HO, L.C.; KORMENDY, J.; MAGORRIAN, J.; PINKNEY, J.; LAINE, S.; POSTMAN, M.; VAN DER MAREL, R.P. "Galaxies with a Central Minimum in Stellar Luminosity Density" AJ 124: 1975-1987, 2002 LI CAUSI, G.; DE MARCHI, G.; PARESCE, F. "On the Accuracy of the Signal-to-Noise Estimates Obtained with the Exposure-Time Calculator of the Wide Field Planetary Camera 2 on Board the Hubble Space Telescope" PASP 114: 770-779, 2002 LIRA, P.; WARD, M.J.; ZEZAS, A.; MURRAY, S.S. "Chandra HRC and HST Observations of NGC 6240: Resolving the Active Galactic Nucleus and Starburst" MNRAS 333: 709-714, 2002 LUBIN, L.M.; OKE, J.B.; POSTMAN, M. "Evidence for Cluster Evolution from an Improved Measurement of the Velocity Dispersion and Morphological Fraction of Cluster 1324+3011 at z = 0.76" AJ 124: 1905-1917, 2002 MENDEZ, B.; DAVIS, M.; MOUSTAKAS, J.; NEWMAN, J.; MADORE, B.F.; FREEDMAN, W.L. "Deviations from the Local Hubble Flow. I. The Tip of the Red Giant Branch as a Distance Indicator" AJ 124: 213-233, 2002 MOFFAT, A.F.J.; CORCORAN, M.F.; STEVENS, I.R.; SKALKOWSKI, G.; MARCHENKO, S.V.; MUCKE, A.; PTAK, A.; KORIBALSKI, B.S.; BRENNEMAN, L.; MUSHOTZKY, R.; PITTARD, J.M.; POLLOCK, A.M.T.; BRANDNER, W. "Galactic Starburst NGC 3603 from X-rays to Radio" ApJ 573: 191-198, 2002 NELSON, C.A.; COOK, K.H.; AXELROD, T.S.; MOULD, J.R.; ALCOCK, C. "A Proper-Motion Survey for White Dwarfs with the Wide Field Planetary Camera 2" ApJ 573: 644-661, 2002 PALMA, C.; ZONAK, S.G.; HUNSBERGER, S.D.; CHARLTON, J.C.; GALLAGHER, S.C.; DURRELL, P.R.; ENGLISH, J. "The Beginning of the End: Hubble Space Telescope Images of Seyfert's Sextet" AJ 124: 2425-2439, 2002 PAPADEROS, P.; IZOTOV, Y.I.; THUAN, T.X.; NOESKE, K.G.; FRICKE, K.J.; GUSEVA, N.G.; GREEN, R.F. "The Blue Compact Dwarf Galaxy I Zw 18: a Comparative Study of Its Low-Surface-Brightness Component" A&A 393: 461-483, 2002 PASQUALI, A.; NOTA, A.; SMITH, L.J.; AKIYAMA, S.; MESSINEO, M.; CLAMPIN, M. "Multiwavength Study of the Nebula Associated with the Galactic LBV Candidate HD 168625" AJ 124: 1625-1635, 2002 PENG, C.Y. "Assessing Formation Scenarios for the Double Nucleus of M31 Using Two-Dimensional Image Decomposition" AJ 124: 294-309, 2002 PERLMAN, E.S.; STOCKE, J.T.; CARILLI, C.L.; SUGIHO, M.; TASHIRO, M.; MADEJSKI, G.; WANG, Q.D.; CONWAY, J. "The Apparent Host Galaxy of PKS 1413+135: Hubble Space Telescope, ASCA and Very Long Baseline Array Observations" AJ 124: 2401-2412, 2002 PIOTTO, G.; KING, I.R.; DJORGOVSKI, S.G.; SOSIN, C.; ZOCCALI, M.; SAVIANE, I.; DE ANGELI, F.; RIELLO, M.; RECIO BLANCO, A.; RICH, R.M.; MEYLAN, G.; RENZINI, A. "HST Color-Magnitude Diagrams of 74 Galactic Globular Clusters in the HST F439W and F555W Bands" A&A 391: 945-965, 2002 PIZZELLA, A.; CORSINI, E.M.; MORELLI, L.; SARZI, M.; SCARLATA, C.; STIAVELLI, M.; BERTOLA, F. "Nuclear Stellar Disks in Spiral Galaxies" ApJ 573: 131-137, 2002 POULET, F.; CUZZI, J.N.; FRENCH, R.G.; DONES, L. "A Study of Saturn's Ring Phase Curves from HST Observations" Icarus 158: 224-248, 2002 PRITZL, B.J.; ARMANDROFF, T.E.; JACOBY, G.H.; DA COSTA, G.S. "The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda VI" AJ 124: 1464-1485, 2002 PUZIA, T.H.; ZEPF, S.E.; KISSLER-PATIG, M.; HILKER, M.; MINNITI, D.; GOUDFROOIJ, P. "Extragalactic Globular Clusters in the Near-Infrared. II. The Globular Clusters Systems of NGC 3115 and NGC 4365" A&A 391: 453-470, 2002 RAGES, K.; HAMMEL, H.B.; LOCKWOOD, G.W. "A Prominent Apparition of Neptune's South Polar Feature" Icarus 159: 262-265, 2002 RICHER, H.B.; BREWER, J.; FAHLMAN, G.G.; GIBSON, B.K.; HANSEN, B.M.; IBATA, R.; KALIRAI, J.S.; LIMONGI, M.; RICH, R.M.; SAVIANE, I.; SHARA, M.M.; STETSON, P.B. "The Lower Main Sequence and Mass Function of the Globular Cluster Messier 4" ApJ 574: L151-L154, 2002 RUBIN, R.H.; BHATT, N.J.; DUFOUR, R.J.; BUCKALEW, B.A.; BARLOW, M.J.; LIU, X.-W.; STOREY, P.J.; BALICK, B.; FERLAND, G.J.; HARRINGTON, J.P.; MARTIN, P.G. "Temperature Variations from Hubble Space Telescope Imagery and Spectroscopy of NGC 7009" MNRAS 334: 777-786, 2002 SAHA, A.; CLAVER, J.; HOESSEL, J.G. "Cepheids and Long-Period Variables in IC 342" AJ 124: 839-861, 2002 SAHAI, R.; BRILLANT, S.; LIVIO, M.; GREBEL, E.K.; BRANDNER, W.; TINGAY, S.J.; NYMAN, L.-A. "Proper Motions in the Knotty, Bipolar Jet in Henize 2-90" ApJ 573: L123-L127, 2002 SANCHEZ CONTRERAS, C.; SAHAI, R.; GIL DE PAZ, A. "Physical Structure of the Proto-planetary Nebula CRL 618. I. Optical Long-Slit Spectroscopy and Imaging" ApJ 578: 269-289, 2002 SANCHEZ-LAVEGA, A. "Observations of Saturn's Ribbon Wave 14 Years after Its Discovery" Icarus 158: 272-275, 2002 SAND, D.J.; TREU, T.; ELLIS, R.S. "The Dark Matter Density Profile of the Lensing Cluster MS 2137-23: a Test of the Cold Dark Matter Paradigm" ApJ 574: L129-L133, 2002 SANTIAGO, B.; KERBER, L.; CASTRO, R.; DE GRIJS, R. "On the Nature of a Secondary Main-Sequence Turn-Off in the Rich LMC Cluster NGC 1868" MNRAS 336: 139-150, 2002 SCHINNERER, E.; MACIEJEWSKI, W.; SCOVILLE, N.; MOUSTAKAS, L.A. "Toward the Secondary Bar: Gas Morphology and Dynamics in NGC 4303" ApJ 575: 826-844, 2002 SCHMIDT, G.D.; HINES, D.C.; SWITH, S. "The Nascent Bipolar Nebula Surrounding the Carbon-rich Variable CIT 6: Transition to Axisymmetry" ApJ 576: 429-444, 2002 SCHMITT, H.R.; PRINGLE, J.E.; CLARKE, C.J.; KINNEY, A.L. "The Orientation of Jets Relative to Dust Disks in Radio Galaxies" ApJ 575: 150-155, 2002 SCHULTE-LADBECK, R.E.; HOPP, U.; DROZDOVSKY, I.O.; GREGGIO, L.; CRONE, M.M. "The Oldest Stars of the Extremely Metal-Poor Local Group Dwarf Irregular Galaxy Leo A" AJ 124: 896-914, 2002 SIMARD, L.; WILLMER, C.N.A.; VOGT, N.P.; SARAJEDINI, V.L.; PHILLIPS, A.C.; WEINER, B.J.; KOO, D.C.; IM, M.; ILLINGWORTH, G.D.; FABER, S.M. "The DEEP Groth Strip Survey. II. Hubble Space Telescope Structural Parameters of Galaxies in the Groth Strip" ApJS 142: 1-33, 2002 SIMON-MILLER, A.A.; GIERASCH, P.J.; BEEBE, R.F.; CONRATH, B.; FLASAR, F.M.; ACHTERBERG, R.K.; CASSINI CIRS TEAM "New Observational Results Concerning Jupiter's Great Red Spot" Icarus 158: 249-266, 2002 SIRIANNI, M.; NOTA, A.; DE MARCHI, G.; LEITHERER, C.; CLAMPIN, M. "The Low End of the Initial Mass Function in Young Clusters. II. Evidence for Primordial Mass Segregation in NGC 330 in the Small Magellanic Cloud" ApJ 579: 275-288, 2002 SMITH, G.P.; SMAIL, I.; KNEIB, J.-P.; DAVIS, C.J.; TAKAMIYA, M.; EBELING, H.; CZOSKE, O. "A Hubble Space Telescope Lensing Survey of X-ray Luminous Galaxy Clusters -- III. 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"Further Insights into the Structure of 30 Doradus from the Hubble Space Telescope Instruments" AJ 124: 1601-1624, 2002 WALTER, F.M.; LATTIMER, J.M. "A Revised Parallax and Its Implications for RX J185635-3754" ApJ 576: L145-L148, 2002 WEIGELT, G.; BALEGA, Y.Y.; HOFMANN, K.-H.; PREIBISCH, T. "Diffraction-Limited Bispectrum Speckle Interferometry of the Herbig Be Star R Mon" A&A 392: 937-943, 2002 WHITMORE, B.C.; SCHWEIZER, F.; KUNDU, A.; MILLER, B.W. "The Luminosity Functions of Old and Intermediate-Age Globular Clusters in NGC 3610" AJ 124: 147-157, 2002 WHITMORE, B.C.; ZHANG, Q. "What Fraction of the Young Clusters in the Antennae Galaxies Are `Missing'?" AJ 124: 1418-1434, 2002 WINDHORST, R.A.; TAYLOR, V.A.; JANSEN, R.A.; ODEWAHN, S.C.; CHIARENZA, C.A.T.; CONSELICE, C.J.; DE GRIJS, R.; DE JONG, R.S.; MACKENTY, J.W.; ESKRIDGE, P.B.; FROGEL, J.A.; GALLAGHER, J.S. III; HIBBARD, J.E.; MATTHEWS, L.D.; O'CONNELL, R.W. 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